The quad trac is an alltime 4wheel drive system. it does have a control module that helps transfer the power from front to rear. if it is a 2008 it should be under warranty and you can have it checked out for proper operation

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If you are driving on the highway in 4wd drive the poise may be from the tyres trying to slip and equalise the drive line torque that is building up . Rule of thumb for all 4 wd vehicles is to restrict 4wd to loose surfaces (gravel-snow-ice -grass- mud --any surface that allows the tyres to slip) to relieve the torque wind up.

On the Jeep models, ESP means electronic stability program which is the same as traction control.There are 3 different versions of four wheel drive on Jeep Grand Cherokees with the base version being all wheel drive.Your owners manual should tell you which version you have and how it operates.

If your 4wd selector has three positions (including neutral) you have quadratrack. If you have more, it's not. Quadratrack has no position for selecting 2wd because it does that by itself, only engaging the front wheels when the rear wheels begin to slip.

If you have a CJ or Cherokee, when you move the 4x4 lever, it engages the transfer case which then transmits power to the front as well as the rear wheels. For most (99%) of all four wheel use, you use the front position on the shifter one notch behind the two wheel drive setting. Use 4 low only for pulling vehicles out of mud etc and don't drive in that range. If it sticks in 4wd after disengaging it, usually backing up about twenty feet will help.If you have a Grand Cherokee, the 4x4 usually is a quadratrack unit. That one stays engaged but only goes into 4wd mode when the rear wheels begin to slip. (by itself). Rules for using low are the same.It is very important to run the exact same size and style tires on any 4x4. It is mandatory on quadratrack units. Use of odd sized tires can cause driveline damage.There are variations on different year vehicles but the basics remain the same.

With the Jeep in park, move the left shifter to 4 wheel drive. Proceed to put right shifter into drive, proceed to drive. Only use 4wheel drive when neccessary...ie...snow, mud, use 4 wheel lo in steep incline or when really bogged down.

Four low is almost never used. I use it on very steep rocky or muddy trails in the woods or to pull someone out of mud or a ditch. Though some will shift standing still it is best do do this while rolling. Four high can be shifted at low speeds of 2 to about 35mph (higher also but not really good idea) Low can only be shifted between 2 to 10mph. If you find yourself stuck and unable to shift because you aren't rolling you can also turn the engine off, engage the transfer case and re-start. That avoids having the gears clashing together. Best rule is if it begins to grind, don't force it.

Most of those have Quadratrack which is full time four wheel drive. (lever all the way to front) neutral is used when towing your vehicle and low range is only used when in severe conditions or pulling another vehicle from a mud hole etc. That can be engaged by rolling slowly forward and pulling the lever all the way back. On all other systems though some can be engaged at a standstill, it usually id better to shift while rolling, usually below 20mph. Neutral in all systems is as I said before.If it cannot be shifted, or it does not engage, likely it is either not properly adjusted or the transfer case or another component is worn.